Using high-quality imported soybeans as raw material, pressed soybean meal comes in different sizes, irregular flat particles, with obvious characteristics of particles soaked in liquid and then dried. The particles are rough but without edges, generally hard and brittle, without greasiness, light yellow or light yellowish-brown. Soybean hull fragments in the meal are usually curled. Through impurity removal, dehulling (or non-dehulling), degreasing (non-degreasing or partial degreasing) and other processes, it is used as a fermentation nitrogen source for antibiotics, biopesticides and other products.